ArticleSupportive care in cancer : official journal of the Multinational Association of Supportive Care in Cancer2025
The impact of COVID-19 pandemic on treatment adherence of patients with breast cancer.
Article in Supportive care in cancer : official journal of the Multinational Association of Supportive Care in Cancer, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Not yet cited in PubMed.
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Abstract
purposeOncology patients may require long-term treatment adherence and may face additional challenges to adherence during national crises. This study investigated changes in treatment adherence among breast cancer patients before and during the COVID-19 pandemic.
methodsA historical prospective study was conducted using electronic medical records of adult breast cancer patients in the post-acute treatment phase; those receiving preventive oral monotherapy were analyzed. Adherence was assessed using the proportion of days covered (PDC).
resultsThe pre-pandemic baseline PDC among 4274 patients was 78.5%. During the four COVID-19 waves (Feb 2020-Oct 2021), patients with low pre-pandemic adherence (PDC < 75%) showed a significant increase in adherence (from 59 to 77%), while those with high pre-pandemic adherence (PDC < 75%) experienced a decline (from 94 to 88%). A statistically significant decline was observed from wave 1 (85.69%) to wave 4 (80.69%), p < 0.001 . Older age was associated with higher adherence (p.(0.001 > Patients vaccinated during the third wave exhibited a significant decline in adherence between the first and fourth waves (p < 0.001).
conclusionsThis study emphasizes the need to monitor and support medication adherence among patients with chronic oncology conditions during health crises. The COVID-19 pandemic revealed shifts in adherence patterns, highlighting the urgency of improving healthcare preparedness, enhancing access to services, and ensuring treatment continuity in future emergencies.
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